2 The world’s largest desert is Antarctica. That’s right, an area doesn’t have to be hot to qualify—it just needs to lose more moisture than it gains.

3 There are parts of the Atacama Desert in Chile where no rain has ever been recorded. Scientists believe portions of the region have been in an extreme desert state for 40 million years—longer than any other place on Earth.

5 If you get lost in the desert, you don’t have to urinate on your shirt and wear it on your head like Bear Grylls to avoid dying of thirst. You can suck water from the branches of some palms, such as buri and rattan.

6 Contrary to lore, cacti are not a sure thing. If you want a sip from a barrel cactus, you’ll need a machete to carve it open—and choosing the wrong species could give you headaches and diarrhea.

7 Then again, if you are lost in the desert, headaches and diarrhea might not be your biggest problem.

8 You’re better off with a prickly pear cactus. But wait until night so you don’t expend water sweating.

9 The world record for crossing the Sahara by bicycle was set in 2011 by Reza Pakravan, 36, a market security analyst in London, who made the 1,084-mile journey in 13 days, 5 hours, 50 minutes, and 14 seconds. He started in Algeria, cycled south, then turned east through Niger and Chad to reach Sudan.

10 Pakravan’s guide hauled the 6,000 calories of food and 7 liters of water he consumed each day.

12 Workers on the highway occasionally stumble across dehydrated corpses.

13 To build a stretch of road through the Mauritanian desert, engineers erected nylon curtains and planted drought-tolerant trees to hold back the dunes. Extreme temperature fluctuations killed the trees and buckled the road. A multilayered roadbed composed of seashells solved the buckling, but the shifting sand still, well, shifts.

14 About 46,000 square miles of arable land turn to desert every year due to climate change and practices such as forest clear-cutting. Desertification threatens the livelihoods of more than 1 billion people in 110 countries, the U.N. says.

15 About 1,000 square miles of Chinese land turns into desert every year, fueling deadly, globe-circling dust storms.

16 In northeastern China, a Green Great Wall of shrubs and trees now being planted may win back the edges of the Gobi Desert. The wall will eventually stretch 2,800 miles from outer Beijing through Inner Mongolia.

17 Combating desertification doesn’t require high tech. In Burkina Faso, one village increased crop yields 50 percent just by positioning stones to slow runoff and digging pits to collect rainwater.

18 German particle physicist Gerhard Knies calculated that in six hours, the world’s deserts receive more energy from the sun than humans consume in a year. An 8,100-square-mile stretch of Saharan desert—an area the size of Wales—could power all of Europe.

19 That calculation inspired the 2009 formation of the Desertec Industrial Initiative, a project that aims to construct a network of solar and wind farms stretching across Africa and the Middle East. It would connect electricity to Europe via high-voltage DC cables.

20 Desertec would cost an estimated $500 billion, but by 2050 it could supply enough renewable, nonpolluting electricity to fill 15 percent of Europe’s demand.